The Case IH Magnum 400 tractor engine horsepower is 391 hp | 291.6 kW, PTO horsepower is 345 hp | 257.3 kW, and the drawbar horsepower is 309.80 hp | 231.0 kW.
Case IH Magnum 400 Horsepower Specs
| Engine gross horsepower | 391 hp | 291.6 kW |
|---|---|
| PTO horsepower claimed | 345 hp | 257.3 kW |
| PTO horsepower tested | 390.64 hp | 291.3 kW |
| Drawbar horsepower tested | 309.80 hp | 231.0 kW |
Case IH Magnum 400 Useful Horsepower Calculations
| PTO-to-engine power transfer | 88.2% of engine hp reaches the PTO |
|---|---|
| Drawbar-to-engine power transfer | 79.2% of engine hp reaches the drawbar |
| Drawbar-to-PTO power ratio | 89.8% drawbar hp vs PTO hp |
| Engine size per PTO horsepower | 1.5 ci per PTO hp |
| PTO horsepower per liter | 39.7 PTO hp per L |
| Engine size per engine horsepower | 1.4 ci per engine hp |
| Engine horsepower per liter | 44.9 engine hp per L |
| Torque per PTO horsepower | 4 lb-ft per PTO hp |
| Rated speed per PTO horsepower | 5.8 rpm per PTO hp |
Case IH Magnum 400 Engine Specs
| Engine type | variable-geometry turbocharged diesel |
|---|---|
| Displacement | 531 ci | 8.7 L |
| Bore and stroke | 4.606×5.315 inches | 117 x 135 mm |
| Rated RPM | 2000 |
| Torque | 1364 lb-ft | 1849.6 Nm |
| Torque RPM | 1400 |
Case IH Magnum 400 Fuel, Cooling, Starting & Service Specs
| Starter volts | 12 |
|---|---|
| Battery volts | 12 |
Case IH Magnum 400 Horsepower Comparison Charts
Engine horsepower comparison
PTO horsepower comparison
Drawbar horsepower comparison
Displacement comparison
Torque comparison
Rated RPM comparison
Engine size per PTO HP
Benchmarks use practical low, average and high ranges for the large ag tractor category. Use the operator manual and actual engine/tractor configuration before sizing implements or judging working power.
Case IH Magnum 400 Horsepower FAQ
How much horsepower does the Case IH Magnum 400 have?
The listed engine output is 391 hp, above the 210 hp benchmark average. That is a higher-power result, so ballast, tire setup and implement width matter if you want to use the full 391 hp.
How much PTO horsepower does the Case IH Magnum 400 have?
The listed PTO output is 345 hp, above the 175 hp benchmark average. That is the number to use for mowers, balers, augers, pumps and other PTO tools that need up to about 345 hp.
How much drawbar horsepower does the Case IH Magnum 400 have?
The listed drawbar output is 309.8 hp, above the 150 hp benchmark average. That makes the 309.8 hp drawbar number more useful than engine hp for tillage and heavy pulling.
How much engine power reaches the PTO on the Case IH Magnum 400?
The PTO-to-engine transfer works out to 88.2%, from 391 engine hp to 345 PTO hp. That is a normal usable range for judging PTO implement fit.
How efficient is the Case IH Magnum 400 for pulling work?
The drawbar-to-engine transfer is about 79.2%, from 391 engine hp to 309.8 drawbar hp. That gives a more grounded pulling estimate than engine horsepower alone.
Is the Case IH Magnum 400 better judged by PTO hp or drawbar hp?
The drawbar output is about 89.8% of PTO output, comparing 309.8 drawbar hp with 345 PTO hp. That helps separate pulling ability from PTO implement ability.
How big is the Case IH Magnum 400 engine?
The engine displacement is 531 ci, close to the 520 ci benchmark average. It is close to the normal engine-size range for this horsepower class.
Is the Case IH Magnum 400 engine stressed for its PTO horsepower?
The engine has about 1.5 cubic inches per PTO hp, using 531 ci and 345 PTO hp. That is a smaller-displacement, higher-output style result.
How much PTO horsepower per liter does the Case IH Magnum 400 make?
The output density is about 39.7 PTO hp per liter, using 345 PTO hp and 8.7 L of displacement. Higher hp/L means more output squeezed from each liter; lower hp/L usually means a more relaxed engine tune.
Horsepower and engine specs can vary by year, market, engine option, fuel system, test standard and tractor configuration. Check the operator manual, spec plate, parts book and official caseih.com website before buying parts, sizing implements or making repair decisions.
